I need help on starting acting!!!!

Hi my name is Kim. I want to start acting and I am thinking of joining the Sydney Talent Company in Quakers Hill, Sydney. Would that be the right thing to do. I am keen on acting, singing and dancing and I want to be a performer. I am turning 13 now am I to late to start acting? I heared that actors need a acting resume (or otherwise known as CV) in auditions if I go to this Talent Company will they give me some kind of form I need to fill out? If I am to have an acting resume would the Rock Eisteddford be allowed to be included because it does require a bit of drama.
If anyone can help I will appreciate it. I need to know the first step to getting into acting. Thank you !